The Queen and the Duchess of Cornwall have been treated to a demonstration by medical detection dogs at the Royal Mews in Buckingham Palace today. Whilst there were no Corgis in action, the monarch was impressed by a range of breeds from Labradors to Spaniels. Report by Swinnertonl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn